From nobody Wed Dec 31 12:45:15 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66035C0018A for ; Sat, 4 Nov 2023 03:56:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346238AbjKDD4B (ORCPT ); Fri, 3 Nov 2023 23:56:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59648 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234316AbjKDDzs (ORCPT ); Fri, 3 Nov 2023 23:55:48 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5B5141AA; Fri, 3 Nov 2023 20:55:44 -0700 (PDT) Received: from dggpemm100001.china.huawei.com (unknown [172.30.72.54]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4SMkKh6BgFzvQ5W; Sat, 4 Nov 2023 11:55:36 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) by dggpemm100001.china.huawei.com (7.185.36.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Sat, 4 Nov 2023 11:55:40 +0800 From: Kefeng Wang To: Andrew Morton CC: , , Matthew Wilcox , David Hildenbrand , , Kefeng Wang Subject: [PATCH v2 01/10] mm: swap: introduce pfn_swap_entry_to_folio() Date: Sat, 4 Nov 2023 11:55:13 +0800 Message-ID: <20231104035522.2418660-2-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20231104035522.2418660-1-wangkefeng.wang@huawei.com> References: <20231104035522.2418660-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm100001.china.huawei.com (7.185.36.93) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Introduce a new pfn_swap_entry_to_folio(), it is similar to pfn_swap_entry_to_page(), but return a folio, which allow us to completely replace the struct page variables with struct folio variables. Signed-off-by: Kefeng Wang --- include/linux/swapops.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/swapops.h b/include/linux/swapops.h index bff1e8d97de0..85cb84e4be95 100644 --- a/include/linux/swapops.h +++ b/include/linux/swapops.h @@ -468,6 +468,19 @@ static inline struct page *pfn_swap_entry_to_page(swp_= entry_t entry) return p; } =20 +static inline struct folio *pfn_swap_entry_to_folio(swp_entry_t entry) +{ + struct folio *folio =3D pfn_folio(swp_offset_pfn(entry)); + + /* + * Any use of migration entries may only occur while the + * corresponding folio is locked + */ + BUG_ON(is_migration_entry(entry) && !folio_test_locked(folio)); + + return folio; +} + /* * A pfn swap entry is a special type of swap entry that always has a pfn = stored * in the swap offset. They are used to represent unaddressable device mem= ory --=20 2.27.0